North Korean TV shows 'drone attack' drill

Foreign diplomats in Pyongyang are discussing a North Korean evacuation advisory as concerns grow that the isolated state was preparing a missile launch at a time of soaring nuclear tensions.

The heads of all EU missions had agreed to meet to hammer out a common position after Pyongyang warned embassies it would be unable to guarantee their safety if a conflict broke out and that they should consider leaving.

Most governments made it clear they had no plans to withdraw any personnel, and some suggested the advisory was a ruse to fuel growing global anxiety over the current crisis on the Korean peninsula.

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"We believe they have taken this step as part of their country's rhetoric that the US poses a threat to them," a British Foreign Office spokeswoman said in London.

The embassy warning coincided with reports that North Korea had loaded two intermediate-range missiles on mobile launchers and hidden them in underground facilities near its east coast.

"The North is apparently intent on firing the missiles without prior warning," the South's Yonhap news agency quoted a senior government official as saying.

They were reported to be Musudan missiles, which have never been tested, but are believed to have a range of around 3000km, which could theoretically be pushed to 4000 with a light payload.

That would cover any target in South Korea and Japan, and possibly even reach US military bases located on the Pacific island of Guam.

The White House said Friday it "would not be surprised" by a missile test.

"We have seen them launch missiles in the past.... And it would fit their current pattern of bellicose, unhelpful and unconstructive rhetoric and actions," White House spokesman Jay Carney said.

The Pentagon warned any such test would be "a provocative act", with spokesman George Little urging Pyongyang to "follow international norms and abide by their commitments".

North Korea, incensed by UN sanctions and South Korea-US military drills, has issued a series of apocalyptic threats of nuclear war in recent weeks.

The North has no proven inter-continental ballistic missile capability that would enable it to strike more distant US targets, and many experts say it is unlikely it can even mount a nuclear warhead on a mid-range missile.

Nevertheless, the international community is becoming increasingly skittish that, with tensions showing no sign of lessening, there is a real risk of the situation spiralling out of control.

The latest expression of concern came from Communist icon Fidel Castro, who warned the danger of a nuclear conflict erupting was higher than it had been at any time since the 1962 Cuban missile crisis.

If war broke out on the Korean peninsula, "there would be a terrible slaughter of people", Castro wrote in a front-page article in Granma, the Cuban Communist Party's newspaper.

The United Nations said it had no plans to pull staff out after the North Korean warning message to embassies and NGOs in Pyongyang.